• 责任者：Zhang Yu (Key Laboratory of Cenozoic Geology and Environment ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Xiong Shangfa
• 刊名：Quaternary Sciences
• 出版年：2011
• 卷期：31(5)
• 关键词：新近纪 ; Neogene Period ; 第四纪 ; Quaternary ; 碳同位素 ; carbon isotopes ; 氧同位素 ; oxygen isotopes ; 甘肃 ; Gansu Province
• 页码：p.800-811
• 图表：6 illus., 57 refs.
• 分类号：1200
• issnNo：ISSN1001-7410
• isbnNo：CN11-2708/P

///The global expansion of C₄ plants during the Late Cenozoic is an important event in the Earth environmental-ecosystem evolution. Reconstructing the geological history of C₄ plants holds a key in the understanding of the patterns and mechanisms of the Ceonzoic climate change, global floras evolution and the long-term variations in atmospheric CO₂. Previous studies have demonstrated that during ca.7~4Ma, soil carbonate records (δ ¹³C_sc)in the Chinese Loess Plateau display a southern-ward negative trend, indicative of a southern-ward expansion of C₄ plants during the Late Miocene and the Early Pliocene. In this paper,  the authors report a study based on δ ¹³C_sc of loess-red clay sequence from the Baishui and Zhuanglang sections near the Liupanshan region, and the result shows that C₄ plants expansion may have initiated as early as at ca. 20 Ma with C₄ component up to 15 ％ ~40 ％ during the Miocene.